Nice tutorial Jim, adding to my engineering library, good stuff.
On Friday, July 4, 2014, Tesla Coil Mailing List <tesla@xxxxxxxxxx> wrote:
> Hi,
>
> I landed on a good tutorial I missed before with a great wye:wye ratio
> graphic and neutral calculations. Scroll down to wye:wye voltage graphic,
> nice.
>
>
> http://www.electronics-tutorials.ws/transformer/three-phase-transformer.html
>
> If interested...
> Jim
>
> > -----Original Message-----
> > From: Jim Mora [mailto:wavetuner@xxxxxxxxx <javascript:;>]
> > Sent: Thursday, July 03, 2014 11:42 PM
> > To: 'Tesla Coil Mailing List'
> > Subject: Calculating the turns ratio in 3 phase HV
> >
> > Hi All,
> >
> > I have the Raytheon innards on the "bench" and the oil tank safely stowed
> > and covered. The oil "looks" very good to me and amber clear; there is no
> > sign of any water in the tank. It was probably well maintained until
> taken
> > out of service. Anyway, since the transformer is out of the tank,
> > measuring the transformer output with a voltage divider is no longer
> > practical so I need to determine the turns ratio. I seem to remember with
> > pigs, back feeding 120Vac into the HV was enough maybe to energize the
> > core and measure the LV. So the question is - if I feed 120v into HV 1
> > phase winding, I believe I read somewhere that LV 1 -N should reflect the
> > direct turns ratio as in single phase. It is Wye:Wye, there is neutral on
> > the primary but it is not on the schematic for the secondary as it is not
> > needed in 6 pulse operation. I have to either find the secondary junction
> > point or back feed 120 volts on a HV phase to another phase. I'm not too
> > sure how to calculate it then. Would a like phase to phase LV be the
> > correct voltage ratio value?
> >
> > If the transformer HV and six pulse calculates to the stated 24KV out,
> > this would not be a good candidate for 6P resonant charging; and, I sure
> > would like to know that at this juncture!
> >
> > Thanks,
> > Jim Mora
> >
> > BTW, I found a tag that states "Ground Beacon", Federal Aviation...pulsed
> > transmitter?
>
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--
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA
Sharpe's Axiom of Murphy's Law
"Physics trumps opinion!"
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